/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
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 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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package org.hisp.dhis.system.deletion;

import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;

public abstract class JdbcDeletionHandler extends DeletionHandler {
  private NamedParameterJdbcTemplate npTemplate;

  @Autowired
  public void setNamedParameterJdbcTemplate(NamedParameterJdbcTemplate npTemplate) {
    this.npTemplate = npTemplate;
  }

  protected final int count(String sql, Map<String, Object> parameters) {
    // OBS! Need to use queryForList to allow no result rows
    List<Integer> count =
        npTemplate.queryForList(sql, new MapSqlParameterSource(parameters), Integer.class);
    return count.isEmpty() ? 0 : count.get(0);
  }

  protected final boolean exists(String sql, Map<String, Object> parameters) {
    return count(sql, parameters) > 0;
  }

  protected final DeletionVeto vetoIfExists(
      DeletionVeto veto, String sql, Map<String, Object> parameters) {
    return exists(sql, parameters) ? veto : DeletionVeto.ACCEPT;
  }

  protected final int delete(String sql, Map<String, Object> parameters) {
    return npTemplate.update(sql, parameters);
  }

  protected final String firstMatch(String sql, Map<String, Object> parameters) {
    if (!sql.toLowerCase().contains("limit 1")) {
      sql = sql + " limit 1";
    }
    List<String> names =
        npTemplate.queryForList(sql, new MapSqlParameterSource(parameters), String.class);
    return names.isEmpty() ? null : names.get(0);
  }
}
